For my geese, PiedPiper, I started with Bonnie's Mountain/Goose triangle the size she had us cut it from the strip. Instead of using the two squares method. I cut an oversized square which I then sliced on the diagonal and centered the too big corner triangle on the correctly sized goose.
Many people used different techniques. Just keep in mind that it does matter which side is which on the 3 colored ones.
I press open so could ignore all that, but if you press to the side her blocks will go together better if you follow her directions on which way/how/when to do the seams.